I've tested your code and it passed at 5.5 second interval, closing.

Codewars always takes a little longer than normal programmes.

issue not clear, OP can reraise one if he encounters the issue (in a more specific manner)

PHP working for me. Maybe they fixed it.

No, the control function in PHP does round the results, your problem must be something else.

I see the error message is showing the results without rounding, that's weird. But you can see the same behaviour in the sample tests.

For example, for this test:

$this->assertEquals(1.62, square_area(2));

Returning a value without rounding, you'll get this error message:

Failed asserting that 1.6211389382774046 matches expected 1.6200000000000001.

And you can see the expected value is rounded to two decimals in the assertion.